<template>
  <div>
    <div class="shopcart">
      <div class="content" @click="toggleList">
        <div class="content-left">
          <div class="logo-wrapper">
            <!-- <div class="logo" :class="{'highlight':totalCount>0}">
              <i class="icon-shopping_cart" :class="{'highlight':totalCount>0}"></i>
            </div> -->
            <icon name="cart" :scale="3" style="color: #fff;"></icon>
            <div class="num" v-show="totalCount>0">{{totalCount}}</div>
          </div>
          <div class="price" :class="{'highlight':totalPrice>0}">￥{{totalPrice}}</div>
          <!-- <div class="desc">另需配送费￥{{deliveryPrice}}元</div> -->
        </div>
        <div class="content-right" @click.stop.prevent="pay">
          <div class="pay enough">
            去结算
          </div>
        </div>
      </div>
      <div class="ball-container">
        <div v-for="ball in balls">
          <transition name="drop" @before-enter="beforeDrop" @enter="dropping" @after-enter="afterDrop">
            <div class="ball" v-show="ball.show">
              <div class="inner inner-hook"></div>
            </div>
          </transition>
        </div>
      </div>
      <transition name="fold">
        <div class="shopcart-list" v-show="listShow">
          <div class="list-header">
            <h1 class="title">购物车</h1>
            <span class="empty" @click="empty">清空</span>
          </div>
          <div class="list-content" ref="listContent">
            <ul>
              <li class="food" v-for="food in selectFoods">
                <span class="name">{{food.name}}</span>
                <div class="price">
                  <span>￥{{food.price*food.count}}</span>
                </div>
                <div class="cartcontrol-wrapper">
                  <cartcontrol @add="addFood" :food="food"></cartcontrol>
                </div>
              </li>
            </ul>
          </div>
        </div>
      </transition>
    </div>
    <transition name="fade">
      <div class="list-mask" @click="hideList" v-show="listShow"></div>
    </transition>
  </div>
</template>

<script type="text/ecmascript-6">
  import BScroll from 'better-scroll';
  import cartcontrol from './CartControl';
  export default {
    props: {
      selectFoods: {
        type: Array,
        default() {
          return [
            {
              price: 10,
              count: 1
            }
          ];
        }
      },
      deliveryPrice: {
        type: Number,
        default: 0
      },
      minPrice: {
        type: Number,
        default: 0
      }
    },
    data() {
      return {
        balls: [
          {
            show: false
          },
          {
            show: false
          },
          {
            show: false
          },
          {
            show: false
          },
          {
            show: false
          }
        ],
        dropBalls: [],
        fold: true
      };
    },
    computed: {
      totalPrice() {
        let total = 0;
        this.selectFoods.forEach((food) => {
          total += food.price * food.count;
        });
        return total;
      },
      totalCount() {
        let count = 0;
        this.selectFoods.forEach((food) => {
          count += food.count;
        });
        return count;
      },
      payDesc() {
        if (this.totalPrice === 0) {
          return `￥${this.minPrice}元起送`;
        } else if (this.totalPrice < this.minPrice) {
          let diff = this.minPrice - this.totalPrice;
          return `还差￥${diff}元起送`;
        } else {
          return '结算';
        }
      },
      payClass() {
        if (this.totalPrice < this.minPrice) {
          return 'not-enough';
        } else {
          return 'enough';
        }
      },
      listShow() {
        if (!this.totalCount) {
          this.fold = true;
          return false;
        }
        let show = !this.fold;
        if (show) {
          this.$nextTick(() => {
            if (!this.scroll) {
              this.scroll = new BScroll(this.$refs.listContent, {
                click: true
              });
            } else {
              this.scroll.refresh();
            }
          });
        }
        return show;
      }
    },
    methods: {
      drop(el) {
        for (let i = 0; i < this.balls.length; i++) {
          let ball = this.balls[i];
          if (!ball.show) {
            ball.show = true;
            ball.el = el;
            this.dropBalls.push(ball);
            return;
          }
        }
      },
      toggleList() {
        if (!this.totalCount) {
          return;
        }
        this.fold = !this.fold;
      },
      hideList() {
        this.fold = true;
      },
      empty() {
        this.selectFoods.forEach((food) => {
          food.count = 0;
        });
      },
      pay() {
        if (this.totalPrice < this.minPrice) {
          return;
        }
        window.alert(`支付${this.totalPrice}元`);
      },
      addFood(target) {
        this.drop(target);
      },
      beforeDrop(el) {
        let count = this.balls.length;
        while (count--) {
          let ball = this.balls[count];
          if (ball.show) {
            let rect = ball.el.getBoundingClientRect();
            let x = rect.left - 32;
            let y = -(window.innerHeight - rect.top - 22);
            el.style.display = '';
            el.style.webkitTransform = `translate3d(0,${y}px,0)`;
            el.style.transform = `translate3d(0,${y}px,0)`;
            let inner = el.getElementsByClassName('inner-hook')[0];
            inner.style.webkitTransform = `translate3d(${x}px,0,0)`;
            inner.style.transform = `translate3d(${x}px,0,0)`;
          }
        }
      },
      dropping(el, done) {
        /* eslint-disable no-unused-vars */
        let rf = el.offsetHeight;
        this.$nextTick(() => {
          el.style.webkitTransform = 'translate3d(0,0,0)';
          el.style.transform = 'translate3d(0,0,0)';
          let inner = el.getElementsByClassName('inner-hook')[0];
          inner.style.webkitTransform = 'translate3d(0,0,0)';
          inner.style.transform = 'translate3d(0,0,0)';
          el.addEventListener('transitionend', done);
        });
      },
      afterDrop(el) {
        let ball = this.dropBalls.shift();
        if (ball) {
          ball.show = false;
          el.style.display = 'none';
        }
      }
    },
    components: {
      cartcontrol
    }
  };
</script>

<style lang="less" scoped>
  @import '~@/styles/variables.less';

  .shopcart {
	position: fixed;
	left: 0;
	bottom: 0;
	z-index: 50;
	width: 100%;
	height: 48px;
	.content {
		display: flex;
		background: #141d27;
		font-size: 0;
		color: rgba(255,255,255,0.4);
		.content-left {
			flex: 1;
			.logo-wrapper {
				display: flex;
        justify-content: center;
        align-items: center;
				vertical-align: top;
				position: relative;
				top: -10px;
				margin: 0 12px;
				padding: 6px;
				width: 56px;
				height: 56px;
				box-sizing: border-box;
				border-radius: 50%;
				background: #141d27;
				.logo {
					width: 100%;
					height: 100%;
					border-radius: 50%;
					text-align: center;
					background: #2b343c;
					.icon-shopping_cart {
						line-height: 44px;
						font-size: 24px;
						color: #80858a;
					}
					.icon-shopping_cart.highlight {
						color: #fff;
					}
				}
				.logo.highlight {
					background: #00a0dc;
				}
				.num {
					position: absolute;
					top: 0;
					right: 0;
					width: 24px;
					height: 16px;
					line-height: 16px;
					text-align: center;
					border-radius: 16px;
					font-size: 9px;
					font-weight: 700;
					color: #fff;
					background: #f01414;
					box-shadow: 0 4px 8px 0 rgba(0,0,0,0.4);
				}
			}
			.price {
				display: inline-block;
				vertical-align: top;
				margin-top: 12px;
				line-height: 24px;
				padding-right: 12px;
				box-sizing: border-box;
				border-right: 1px solid rgba(255,255,255,0.1);
				font-size: 16px;
				font-weight: 700;
			}
			.price.highlight {
				color: #fff;
			}
			.desc {
				display: inline-block;
				vertical-align: top;
				margin: 12px 0 0 12px;
				line-height: 24px;
				font-size: 10px;
			}
		}
		.content-right {
			flex: 0 0 105px;
			width: 105px;
			.pay {
				height: 48px;
				line-height: 48px;
				text-align: center;
				font-size: 12px;
				font-weight: 700;
			}
			.pay.not-enough {
				background: #2b333b;
			}
			.pay.enough {
				background: @color-theme-yellow-medium;
				color: #fff;
			}
		}
	}
	.ball-container {
		.ball {
			position: fixed;
			left: 32px;
			bottom: 22px;
			z-index: 200;
			transition: all 0.4s cubic-bezier(0.49, -0.29, 0.75, 0.41);
			.inner {
				width: 16px;
				height: 16px;
				border-radius: 50%;
				background: #00a0dc;
				transition: all 0.4s linear;
			}
		}
	}
	.shopcart-list {
		position: absolute;
		left: 0;
		top: 0;
		z-index: -1;
		width: 100%;
		transform: translate3d(0, -100%, 0);
		.list-header {
			height: 40px;
			line-height: 40px;
			padding: 0 18px;
			background: #f3f5f7;
			border-bottom: 1px solid rgba(7,17,27,0.1);
			.title {
				float: left;
				font-size: 14px;
				color: #07111b;
			}
			.empty {
				float: right;
				font-size: 12px;
				color: #00a0dc;
			}
		}
		.list-content {
			padding: 0 18px;
			max-height: 217px;
			overflow: hidden;
			background: #fff;
			.food {
				position: relative;
				padding: 12px 0;
				box-sizing: border-box;
        font-size: 0;
				.name {
					line-height: 24px;
					font-size: 14px;
					color: #07111b;
				}
				.price {
					position: absolute;
					right: 90px;
					bottom: 12px;
					line-height: 24px;
					font-size: 14px;
					font-weight: 700;
					color: #f01414;
				}
				.cartcontrol-wrapper {
					position: absolute;
					right: 0;
					bottom: 12px;
				}
			}
		}
	}
	.shopcart-list.fold-enter-active {
		transition: all 0.5s;
	}
	.shopcart-list.fold-leave-active {
		transition: all 0.5s;
		transform: translate3d(0, 0, 0);
	}
	.shopcart-list.fold-enter {
		transform: translate3d(0, 0, 0);
	}
}
.list-mask {
	position: fixed;
	top: 0;
	left: 0;
	width: 100%;
	height: 100%;
	z-index: 40;
	backdrop-filter: blur(10px);
	opacity: 1;
	background: rgba(7,17,27,0.6);
}
.list-mask.fade-enter-active {
	transition: all 0.5s;
}
.list-mask.fade-leave-active {
	transition: all 0.5s;
	opacity: 0;
	background: rgba(7,17,27,0);
}
.list-mask.fade-enter {
	opacity: 0;
	background: rgba(7,17,27,0);
}
</style>
